ои4 B СНМ

#include <iostream>
#include <cmath>
#include <vector>
#include <queue>
#include <algorithm>
#include <string>
#include <stack>
#include <set>
#include <map>
#define pii pair <int,int>
#define vec vector
using namespace std;
using ll = long long;
using ld = long double;
using db = double;
void cv(vector <int> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}

void cvl(vector <ll> &v){
    for (auto x: v) cout<<x<<' ';
    cout<<"\n";
}


void cvv(vector <vector <int> > &v){
    for (auto x: v) cv(x);
    cout<<"\n";
}

void cvb(vector <bool> v){
    for (bool x: v) cout<<x<<' ';
    cout<<"\n";
}

void cvs(vector <string>  v){
    for (auto a: v){
        cout<<a<<"\n";
    }
}

void cvp(vector <pii> a){
    for (auto p: a){
        cout<<p.first<<' '<<p.second<<"\n";
    }
    cout<<"\n";
}
int n,m,A,B;
struct ed{
    int a,b,l;
};
vector <ed> E;

vector <int> pr,sz;

bool sh = 1;

int getp(int v){
    if (pr[v] == v){
        return v;
    }
    int p = getp(v);
    pr[v] = p;
    return p;
}

void un(int a, int b){
    a = getp(a);
    b = getp(b);
    if (sh){
        cout<<"PAR a b = "<<a<<' '<<b<<"\n";
    }
    if (a == b)return;
    //sz[b] > sz[a]
    if (sz[a] > sz[b]) swap(a,b);
    sz[b] += sz[a];
    pr[a] = b;
}

int main()
{
    /*ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);*/
    cin>>n>>m;
    map <pii, int> mtr;
    for (int i = 0; i < m; ++i){
            int a,b,l;
            cin>>a>>b>>l;
            a--;
            b--;
            if (a > b) swap(a,b);
            if (mtr.find({a,b}) == mtr.end()){
                mtr[{a,b}] = l;
            }
            else{
                mtr[{a,b}] = max(mtr[{a,b}], l);
            }
    }
    cin>>A>>B;
    for (auto p: mtr){
        //cout<<p.first.first<<' '<<p.first.second<<' '<<p.second<<"\n";
        E.push_back({p.first.first, p.first.second, p.second});
    }
    pr.resize(n);
    sz.assign(n,1);
    for (int i = 0; i < n; ++i){
        pr[i] = i;
    }
    /*if (sh){
        cout<<"sz\n";
        cv(sz);
        cout<<"pr\n";
        cv(pr);
    }*/
    for (ed e: E){
        if (sh){
            cout<<"a b = "<<e.a<<' '<<e.b<<"\n";
        }
        un(e.a, e.b);
    }
    /*if (sh){
        cout<<"sz\n";
        cv(sz);
        cout<<"pr\n";
        cv(pr);
    }*/

}
/*
6 8
1 2 3
1 3 2
1 4 4
1 6 5
2 3 15
3 6 8
3 5 7
4 5 1
1 5

*/